Tang-driven tool.



- 1E. S. GROSS.

TANG DRIVEN TOOL.

-APPLIUATION FILED 002m, 19.11. y

` Patented-Nov. 5, 1912.

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their avenants neer FRANK H. GREGORY, 0F HARRISHLURG, PENNSYLVNA.

TANGDR1VEN T0613.

Specification of Letters Patent.

Ratented Nov. 5, i912.

,Application led fletobexf,y 1911., Serial No. 853,283. v

To all whom it' may concern:

Be it known` that I, ELMER S. Gross, a citizen of the United States, anda resident, of `l-larrisburg, in the county of Dauphin and State ofPennsylvania, have invented new and useful Improvements in Tang- DrivenTools, of which the following is a full, clear, and exact specification,-suchvlas willv enable any one skilled. in the art to una dei-stand anduse the invention as vherein described.

This invention relatesto improvements in' the tangs of tang-driventools, and the sockets therefor, and it has for one of its objects theprovision of a tool having a tang which consists of a plurality of wingsadapted to be engaged by correspondingly-shaped abutments in either thespindle, or the chuck, or the driver-bushing and holder.

The invention has, furthermore, for its object, the peculiarorganization or arrangel ment of such wings so that the tool can beentered into its socket only in certain positions.

Further objects of the invention will hereinafter appear and beparticularly defined in the claims.

The invention has been clearly illustrated in the accompanying drawingsin which similar characters denote similar parts, and in which liigure lis a front view of a socket and a tool held therein in accordance withmy invention; Fig. 2 is a horizontal section thereof on line 2 2 of Fig.1; 3 is side View of the holder, partly broken away, substantially online 3 3 of Fig. l; Fig. t is a front View of the tool shank, peg se,and Fig. 5 is a top view thereof.

Referring to the drawings, 10 denotes the body of the tool, as forinstance', a twist drill having a tapered shank ll, the upper end ofwhich has a tang comprising in the present instance four Wings,1221121), 12, and 12d. Of these, the wings 12a, 12b are in diametricalalinement in exactly the same manner as the ordinary tang in common use,while the other wings, l2, and. l2, consti tute side projections of thestraight tang and are offset centrally (see Fig. 5,) and areconsequently unalined. The several wings are formed on the roundtapershank by a pair of milling cutters (as indicated in dotted lines in Fig.5,) to such an extent longitudinally of the shank that the cut-depthremains uniform from the top downwardto about the line a.

ln order to accommodate or` provide proper driving `engagement betweenthe tang-wings and the holder H, the latteris bored out round farenough, to substantially the extent shown in Fig. 3, while the upperport-ion of the holder body is onl slotted crosswise to correspond tothe posl-A df tions and sizes .of the tang-wings, as at 13, 13b, 13C,and 13d, respectively. Hence there are established four abut'ments onthe holder,`

yas le, 14", lac, led, which drive the respeetive wings.

. i From the foregoing it will be seen that Ta tool having the commontang may be v1used in my -improved holder, which, of

course, is also adapted to receive a tool provided with my improvedtang. Further- "J5 more, that the ordinary socket needs only (inaddition to lthe slot for the drifting key,) a pair of cross slots toadapt it for the reception of my. improved tang tool. Also, that the newtang-drive is practically S twice as powerful as the single-tang construction, without interfering inthe least with the regular standardtaper of the shank. l

-By reason-of the fact that the side wings 35 are off center there isgained the advantage of having the driving faces of 'the abutments nearthe line of force in which. the tool is rotated. Another advantage isthat in case the ordinary .iiat-tang drill isl im used it will be drivenby the heavier abutments of the socket or holder (see Fig. lt will alsobe noted that an ordinary fiatta-ng tool cannot be placed. into thesocket into the cross-slots because the latter are out of register;therefore, it Imust be placed into the regular slots, which are highenough to permit the insertion of a drifting key to remove the4 tool. i

Changes maylbe made in the construction of the tang, especially asto thenumber and shape of' the wings, without departing from. the spirit ofthe invention as set forth in the' appended claims.

l. A tool or socket provided with a tapered shank having its upper endcut to form wings extending longitudinally ofthe shank and offsetrelatively to each other *lo diametricaily of the siiazilr,

2. A tool or socket provided wifh a ffi-v pered shank having :1 tangextending diu- 'lnetricully across the shank, and having wings extendingto opposite sides thereof and offset relatively toeach other dianiefrrieulh of the shnnl 3. The combination with a tool having a hunkprovided with a tang comprising wiugg's', und offset relatively to euchother glinnzetrieailly of the shank of a socket huving slof's extendingthrough the body thereof und adapted to receive said Wings respectively.

-lp The combination With a` tool having :L Shank provided lwith a tangcomprising Wings and offset relatively to euch olher danietrieully ofthe shank, of n Sockel hm ing slots extending` through the body thereofand adapted to receive seid wing, respeetively, one of said slotsextending diametri :2e cally aeross the body and havingl :i grenierlength than the other slolst and adapted lo receive a drifting` hey.

In testimony whereof l here Signed this Specification in the presence oftwo suhserih :fr ing,` witnesses.

' ELMER S. GROSS. Titnessesz WALTER E. .Kizveu'sm'mr C. L. TYSON.

